Goodwill, which is defined as the positive dif- ference between the price paid for the business at the time of acquisition and the market fair va- lue and the net asset value measured within the scope of the growth strategies of the businesses; important in terms of accounting practices. Go- odwill, which is among the assets of the main business, is accounted for as a very important intangible asset item after successful business acquisitions within the scope of a horizontal or vertical growth strategy with the idea of a new formation in the process. Some valuation models can be used in cases where market fair values cannot be calculated during business acquisitions. In this context, the application of goodwill, from both national and international perspectives, has been the subject of examination in the study, re- garding the testing of cash-generating units with goodwill in terms of impairment annually, as of the same period every year, in accordance with the principles of Turkish Accounting Standards.